Short Faceplate. The Gatemaster ERHDM is a heavy duty electric release for gates. It is designed to connect to many existing access control systems, including electronic keypads, quick releases and remote controls. The release can be easily converted between fail safe and fail secure and has a deep locking tongue to allow for more gate tolerance. An integral switch confirms that the gate is closed.. Monitored. Heavy duty. Switchable Fail Safe/Fail Secure. Deep locking tongue